Manually operated dry shaver



March 23, 1943. a. R. NYHAGEN 2,314,731

MANUALLY OPERATED DRY SHAVER Filed May 8, 1939 (Ka a 11L INVENTOR.

BarneyRQ 1197x9617,

p ATTORNEYS Patented Mar. 23, 1943 UNi'TE-D STAT-ES PATENT OFFICE This invention relates generally to dry shavers and refers more particularly to a dry shaver of the manually operated type which includes fixed and movable cutter elements having cooperative cutting edges which effect shearing of the hair by pressure of the movable cutter element against the skin and the rolling of the same thereover.

The invention comprehends an improved manually operable dry shaver which includes a non-rotary cylindrical cutter element having circumferentially spaced cutting teeth and which is carried .by and detachably connected to a handle member together with a rotary hollow cylindrical perforated cutter element surrounding said inner cutter element and mounted to turn freely thereon .so that the .edges of .the perforations cooperate with the teeth of the inner cutter element to shear the hair which protrudes through the perforations when the outer cutter element is pressed against and rolled .over the skin.

More particularly the invention embodies in one of its forms .a pair of nested inner and outer hollow cylindrical cutter elements having circumferentially spaced openings, the edges .of which constitute shearing means when relativelyrotated together with a mounting yoke consisting of separable sections engaging within the inner cutter element and keyed thereto to O-Clothe Same against rotation with a handle engaging with said .mounting yoke for connecting the same in assembled relation.

The invention further contemplates an improved dry shaver of the character set forth in which inner and outer hollow cooperative cylindrical cutter elements are provided together with a yoke for mounting the same with means on the yoke detachably engaging the opposite ends of the inner cutter element to lock the same against rotation and to retain the outer cutter element in surrounding relation to the inner cutter element for free turning movement.

With the above and other objects in view the invention is more fully described in the following specification, pointed out in the appended claims and illustrated in the accompanying drawing in which:

Fig. 1 is a perspective View of a dry shaver constructed in accordance with one form of the invention.

Fig. 2 is a collective perspective view of the cutter elements and the yoke sections in separated relation.

Fig. 3 is an enlarged fragmentary sectional shearing .edges.

An outer hollow cylindrical cutter element I5 is provided which is formed with a plurality of circumferentially spaced rows of perforations 1.6,

said outer cutter element being of a diameter to closely fit over the inner cutter element with suifi cient clearance between the confronting surfaces to permit of free rotation of the outer cutter element when the same is pressed against and rolled over the surface of the skin.

The device further includes a mounting yoke composed of a pair of substantially identical sec.- tions designated generally by the reference characters 20 and 2| and each of which consists of a base portion 2-2 and an angularly disposed upwardly projecting bearing .ear12'3. Ihe base portions 22 of-the yoke sections 20 and 2t are .re-

spectively provided at the inner free ends with mating semi-cylindrical depending stems 24 and 25, the hat surfaces of which are flush with the inner free ends of the bases and the outer surfaces of which are provided with screw threads 26 adapted to coincide with each other when the yoke sections are in mated assembled relation to provide a continuous thread.

In order to serve as a guide to the assembly and mating of the yoke sections, the stems 24 and 25 are provided with interengaging means which as shown consist of a pair of projecting pins 21 on the stem 25 and a pair of apertures or sockets 28 on the stem 24. The inner faces of the bearing cars 23 are provided with circular bosses or trunnions 29 of a diameter to snugly receive thereover the inner peripheries of the annular internal beads [I provided at the opposite ends of the inner cutter element It]. The boss or trunnion 29 on the yoke section 20 is formed with a radial key 30, while one end of the inner cutter element In is provided with one or more keyway notches 3| for engagement with the key 30 to lock the inner cutter element against rotation with reference to the yoke.

A handle 32 is provided which is formed with an internally threaded socket 33 adapted to threadly engage over the mated stems 24 and 25 when the yoke sections are disposed in mated assembled relation for the purpose of retaining the yoke in fixed assembled relation on the handle.

In assembling the device, the outer cutter element or hollow cylindrical sleeve is fitted over the inner cutter element Ii] and the yoke sections and 2| are then brought into mated relation with the trunnions or bosses 29 of the ears 23 fitted within the inner peripheries of the internal annular beads I i with the key 36 engaging one of the keyway notches 3!. At the same time the pins 21 of the stem 25 are engaged in the apertures 28 and the threaded socket 33 of the handle 10 is then screwed onto the mated stem sections 24 and 25. This retains the cutter elements it and I5 within the yoke with the inner cutter element l0 secured against rotation and with the outer cutter element i5 mounted in surrounding relation to the inner cutter element for free ro tation with reference thereto when the outer cutter element is pressed against and rolled over the surface of the skin. outer peripheral surface of the outer cutter element is disposed substantially flush with the peripheral surfaces of the ears 23 so as to protect the skin from any possibility of cutting or scratching by the outer edges of the outer cutter element l5 which,'it will be understood, is of an extremely thin gage material.

In use and operation the pressing of the outer cutter against the skin and the rolling of the same thereover will cause the hairs to enter the perforations l6 and the slots l3 so that the relative turning movement of the outer cutter element with reference to the inner cutter element provides a number of sharp shearing edges for severing the hairs. The severed hairs will pass through the slots 13 to the interior of the inner cutter element l0 where they will be collected and may be periodically removed through openings 34 extending axially through the ears 23 'and the bearing bosses or trunnions 29.

What is claimed is:

l. A manually operable dry shaver including a non-rotary cylindrical inner cutter element having longitudinally extending circumferentially spaced cutting teeth, an outer hollow cylindrical cutter element having perforations defining out- It will be observed that the i to fit within the opposite ends of the inner cutter element when the yoke sections are in mated relation, and a handle member having an interiorly threaded socket engaging with the stem of said yoke sections to lock the same in mated assembled relation to mount the cutter elements between the bearing ears, and interengageable means on the yoke and the inner cutter element to retain the same in fixed relation thereto.

2. A manually operable dry shaver including a non-rotary hollow cylindrical inner cutter element having longitudinally extending circumferentially spaced peripheral cutting teeth, an outer hollow cylindrical cutter element having perforations defining cutting teeth, said outer cutter element surrounding the inner cutter element and mounted to freely turn with reference thereto for cutting engagement with the teeth of the inner cutter element when pressed against and rolled over the skin so as to shear hair protruding through the perforations and extending into the path of the teeth of the inner cutter element, a bearing yoke including a pair of mating sections each having a base portion and an angularly disposed hollow bearing ear and formed with an annular bearing boss adapted to fit within one of the opposite ends of the inner cutter element with the hollow interior of the inner cutter element in communication with the hollow interior of the bearing ears when the yoke sections are in mated relation, a semi-cycylindrical depending stem section on each yoke section having exterior threads which threads are adapted to mate when the yoke sections are mated and a handle member having a threaded socket engageable with said mated stem sections to lock the yoke sections in'mated assembled relation and to mount the cutter element between the bearing ears.

BARNEY R. NYHAGEN. 

